Freetronics Forum

So far I have only used the SD library to get .BMPs from an SD card. Has anyone tried the SdFat library instead? Anecdotes online (e.g https://github.com/greiman/SdFat-beta/issues/2) say it's faster...

Digging up an old thread here... I just wanted to add that you need to use pullup/pulldown resistors (or enable the built-in pullups in your code) so that you don't get spurious movements of the players' paddles. Something like pinMode(P1_UP_PIN, INPUT_PULLUP); pinMode(P2_UP_PIN, INPUT_PULLUP); // a...

Replying to my own post - another option would be to take advantage of the SAMD21's extra RAM and read each image from the SD card into RAM, then dumping the whole thing onto the screen. I think the current driver does it line by line, which might explain why it's a bit slow. And kudos to the Freetr...

Hi all, I'm trying to speed up the screen updates when writing BMPs (aren't we all!). I'm using a Sparkfun SAMD21 mini. It's an ARM M0 core, which I think is roughly the same as an Arduino Zero. The main benefit in this situation is that it has 256kB of program memory, so it should be able to hold t...

Try it! You won't break anything. If you have an oscilloscope you could set a pin high at the start of a drawing operation and then low at the end. Use your oscilloscope to measure the duration... because you can't always trust your eyes :-) Alternatively you could use a technique like at https://st...

According to Jeremy at Jaycar in Bondi Junction, they used to sell a lot of these screens to Fox Studios. Apparently the screens were used in props or sets for the most recent Alien movie... Has anyone seen the film and can confirm?

According to the product page, this board will run off 3.3v. Has anyone tried it? Are there any pitfalls I should be aware of?

Thanks!

After some more testing, it looks like I was having a problem with using up RAM. I was using the example code to display a .BMP. It looks like the issue is with this part: BMP_Status result = oled.displayBMP(image, 0, 0); if(result != BMP_OK) { Serial.print("Error loading BMP "); Serial.println((int...

I think I understand what you mean - using the ICSP port is the same as wiring to PINs. The ICSP port on Arduinos is connected directly to the normal pins on the Arduino and they share the SPI bus. Have a look at the schematic at https://www.arduino.cc/en/uploads/Main/arduino-uno-schematic.pdf to sh...

Nobody has ever seen this problem before? Any suggestions? I can't see any pattern to the issue - the number of frames I get before the image corruption and eventual freezing doesn't seem consistent. I'll try sending simple data straight from the arduino to the screen, to see if taking the SD card r...